行人影响下的信号交叉口通行能力研究

Studies on capacity of signalized intersections influenced by pedestrian traffic

为量化行人交通对信号交叉口通行能力的影响,分析了行人-机动车冲突点处的行人行为特征和人车运行规律,并描述了行人成群到达的现象。在此基础上,利用车队分析法建立冲突点车辆通行能力模型,并且利用实测数据标定模型参数,为计算行人影响下的信号交叉口通行能力提供了分析依据。模型计算的冲突车流通行能力很大程度取决于有效绿灯时间内冲突点处人车冲突的平均次数。模型计算通行能力总体上低于HCM 2000方法,结果随行人流量增加而呈现的下降趋势渐趋平缓。模型建立在冲突点运行规律基础之上,具有较广泛的适应性。研究为混合交通条件下信号交叉口配时设计与交通管理提供了理论基础。

It is a problem of concern to quantify the effect of pedestrian traffic on capacity of signalized intersections. The behaviors of pedestrians and mechanism of pedestrian-vehicle conflict are analyzed in this paper. Pedestrian arrivals in groups are taken into account. Capacity of conflict zone is modeled based on platoon analysis method. The model is calibrated according to field data and lays a foundation for calculating capacity of signalized intersections influenced by pedestrian traffic. Vehicular capacity computed by the proposed model depends much on average conflict times and is generally lower than that by method of Highway Capacity Manual （HCM, 2000） . The downtrend of vehicular capacity becomes less and less sharp accompanied by the increase of conflicting pedestrian volume. The proposed model is developed on basis of mechanism of conflict zone, and is more universally applicable. The research provides a theoretical basis for signal timing and traffic management at intersections in mixed traffic condition.